Oh no doubt at all LBP PSP will do better in Japan compared to the PS3 version. Cannot believe I am about to say this but the PSP of all consoles is quite the software beast in Japan.
NFS: Shift is one which I think is a million seller certainty simply because the last NFS has already done 0.5 million and this one will release during a huge software surge and possible the 4000.
I would think LBP PSP could be hit or miss, the portability of LBP PSP and being able to go anywhere and make levels could be a huge hit. I have no doubt the PSP and PS3 version will be able to connect so it will also cause a surge in LBP PS3 sales.